# Important Links

- [Getting Support](/students/important-links/mh-support.md): Contacting McGraw Hill for SIMnet help and a guide for how to do it.
- [Coded Messages](/students/important-links/mh-support/upload-messages.md): Coded messages for Project and Resources Assignments and what they mean.
- [Support Guidelines](/students/important-links/mh-support/support-guidelines.md): Guidelines on how to best request SIMnet help from McGraw Hill
- [Creating a .har file](/students/important-links/mh-support/har-file.md): How to create a .har file to troubleshoot difficult to diagnose issues
- [Performing a Traceroute](/students/important-links/mh-support/performing-a-traceroute.md): Capturing a traceroute to troubleshoot Internet connectivity issues.